Light Switch Stopped Working

Suddenly, a light switch in my bathroom stopped working. It shares a junction box with two other light switches, both of which still work. I figured it was a bad switch... replaced it. Didn't fix the problem. So, I tested the wires. They are not hot. Strange!

Description of the wiring for this switch: black wire coming from the wall. It is connected to a switch. There are two more wires that go into a cap... with a wire coming off of it and into the switch.

The other two switches in this box have a separate set of capped black wires.

I removed the caps from the two sets of black wires and capped them together. The wires going into the switch are now hot... but, the switch still does not work.